Spintronics and quantum information science are two promising candidates for innovating processing technologies. The combination of these fields enables us to build solid-state platforms studying phenomena realizing multi-functional tasks. For a long time, however, the intersection was limited. This situation has changed significantly over last few years because remarkable progress in coding using magnons. On other hand, significant advances understanding entanglement quasi-particles...

A magnetic skyrmion is a topological object consisting of an inner domain, outer and wall that separates the two domains. The size width are fundamental quantities depend sensitively on material parameters such as exchange energy, anisotropy, Dzyaloshinskii-Moriya interaction, field. However, there no quantitative understanding so far. Here, we present general expressions for obtained from energy considerations. formulas agree almost perfectly with simulations experiments wide range...

We show that parity-time ($\mathcal{PT}$) symmetry can be spontaneously broken in the recently reported energy level attraction of magnons and cavity photons. In $\mathcal{PT}$-broken phase, magnon photon form a high-fidelity Bell state with maximum entanglement. This entanglement is steady robust against perturbation environment, contrast to general wisdom expects instability hybridized when broken. anomaly further understood by compete non-Hermitian evolution particle number conservation...

Magnon-photon coupling has been experimentally realized inside a cavity and the emerging field known as spintronics attracted significant attention for its potential docking with quantum information science. However, one seldom knows whether this implies an entanglement state among magnons photons or not, which is crucial usage in information. Here we study properties antiferromagnet-light system find that between magnon photon nearly zero while magnon-magnon very strong it can be even...

The new field of spin cavitronics focuses on the interaction between magnon excitation a magnetic element and electromagnetic wave in microwave cavity. In strong regime, such an usually gives rise to level anticrossing for magnonic mode. Recently, attractive crossing has been observed, it is explained by non-Hermitian model Hamiltonian. However, mechanism coupling still unclear. We reveal secret using simple with two harmonic oscillators coupled third oscillator large dissipation. further...

An optical frequency comb consists of a set discrete and equally spaced frequencies has found wide applications in the synthesis over broad range spectral electromagnetic waves precise metrology. Despite analogies between magnons photons many aspects, analog an magnonic systems not been reported. Here, we theoretically study magnon-skyrmion interaction find that (MFC) can be generated above threshold driving amplitude, where nonlinear scattering process involving three prevails. The mode...

Abstract Easy creation and manipulation of skyrmions is important in skyrmion based devices for data storage information processing. We show that a nano-second current pulse alone capable creating/deleting manipulating spin valve with perpendicularly magnetized free layer broken chiral symmetry. Interestingly, an in-plane fixed layer, the changes from single domain at zero to Neel wall intermediate density. Reverse polarity, its image inversion. A properly designed pulse, tends convert one...

Nonlinear magnonics studies the nonlinear interaction between magnons and other physical platforms (phonon, photon, qubit, spin texture) to generate novel magnon states for information processing. In this Tutorial, we first introduce interactions of in pure magnetic systems hybrid magnon–phonon magnon–photon systems. Then, show how these can exotic magnonic phenomena. classical regime, will cover parametric excitation magnons, bistability multistability, frequency comb. quantum discuss...

Wave fields with spiral phase dislocations carrying orbital angular momentum (OAM) have been realized in many branches of physics, such as for photons, sound waves, electron beams, and neutrons. However, the OAM states magnons (spin waves)$-$the building block modern magnetism$-$and particularly their implications yet to be addressed. Here, we theoretically investigate twisted spin-wave generation propagation magnetic nanocylinders. The nature is uncovered by showing that eigenmode also...

Quantization effects of the nonlinear magnon-vortex interaction in ferromagnetic nanodisks are studied. We show that circular geometry twists spin-wave fields with spiral phase dislocations carrying quantized orbital angular momentum (OAM). Meanwhile, confluence and splitting scattering twisted magnons off gyrating vortex core (VC) generates a frequency comb consisting discrete equally spaced spectral lines, dubbed as magnon (TMFC). It is found mode spacing TMFC equal to gyration VC OAM...

Spintronics and quantum information science are two promising candidates for innovating processing technologies. The combination of these fields enables us to build solid-state platforms studying phenomena realizing multi-functional tasks. For a long time, however, the intersection was limited due distinct properties classical magnetization, that is manipulated in spintronics, bits, utilized science. This situation has changed significantly over last few years because remarkable progress...

We theoretically and numerically study magnetic domain wall (DW) pinning at a notch in nanowire. Based on the static DW equation, general relationship between an external field structure for given geometry is found. By estimating below which this holds, we obtain depinning theoretically. Our theoretical estimate of compares well with simulation results. Furthermore, our theory explains why transverse one chirality larger than that opposite chirality.

Quantum bits (qubits) with long coherence times are an important element for the implementation of medium- and large-scale quantum computers. In case superconducting planar qubits, understanding improving qubits' quality can be achieved by studying resonators. this paper, we fabricate characterize coplanar waveguide resonators made from aluminum thin films deposited on silicon substrates. We perform three different substrate surface treatments prior to deposition: one chemical treatment...

Current-driven skyrmion motion in random granular films is investigated with interesting findings. For a given current, there exists critical disorder strength below which its transverse could either be boosted damping or hindered above the damping, resulting current and dependences of Hall angle. The boosting comes mainly from force that opposite to driving (current). depends on density strength. However, longitudinal always by disorder. Above strength, skyrmions are pinned....

When a magnon passes through two-dimensional magnetic textures, it will experience fictitious field originating from the 3×3 skew-symmetric gauge fields. To date, only one of three independent components fields has been found to play role in generating field, while other two are perfectly hidden. In this Letter, we show that they concealed nonlinear transport textures. Without loss generality, theoretically study magnon-skyrmion interaction antiferromagnets. By analyzing scattering features...

Damping in magnetization dynamics characterizes the dissipation of magnetic energy and is essential for improving performance spintronics-based devices. While damping ferromagnets has been well studied can be artificially controlled practice, parameters antiferromagnetic materials are nevertheless little known their physical mechanisms or numerical values. Here we calculate using generalized scattering theory combined with first-principles transport computation. For PtMn, IrMn, PdMn FeMn...

We address the problem of how magnetic skyrmions can propagate along a guided direction by parametric pumping. As evidenced our micromagnetic simulations, hardly be driven either static electric field or alone. Although anisotropy modified an field, pumping with oscillating only excite breathing modes. On other hand, break rotational symmetry through Zeeman interaction, but it cannot serve as energy source for propelling skyrmion. Here we found that combination perpendicularly and in-plane...

Abstract Generating and manipulating magnon quantum states for information processing is a central topic in magnonics. The conventional strategy amplifies the nonlinear interaction among magnons to manifest their correlations at cryogenic temperatures, which challenging magnets with vanishingly small nonlinearities. Here we propose an unconventional approach prepare entangled of two distant modes by applying two-tone Floquet field each magnet inside microwave cavity. driving can effectively...

The rise of quantum information science based on hybrid systems bridges different areas research and provides innovative perspectives technology. Magnons show great potential as carriers, but generating robust states magnons in a scalable system remains an outstanding challenge. Here the authors consider superconducting qubit coupled to magnets by dipole interaction. With delicate frequency detuning between magnet qubit, exotic state is found. Interestingly, magnetic dissipation helps...

We investigate the spin Hall magnetoresistance (SMR) in a gadolinium iron garnet (GdIG)/platinum (Pt) heterostructure by angular dependent measurements. The magnetic structure of ferromagnetic insulator GdIG is non-collinear near compensation temperature, while it collinear far from temperature. In regime, SMR signal consistent with usual [Formula: see text] relation well established magnet yttrium garnet, angle between magnetization and polarization direction. both an inverted sign more...

We show that frustrated exchange interactions could stabilize chiral states in a ferromagnet by considering the competition between ferromagnetic (FM) nearest-neighbor (NN) interaction and antiferromagnetic (AFM) next-nearest-neighbor (NNN) interaction. In low-field regime, multisublattice helical state is found, which different from normal one-sublattice FM two-sublattice AFM. As field increases further, skyrmion lattice even stable with much larger energy-preferable window than system...